“Successful investing is about time in the market, not timing the market.” – Peter Lynch

1. Know what you own — and why you own it. Before buying any stock, you should be able to explain what the company does, how it makes money, and exactly why you are investing in it in a simple, two-minute monologue. If you can’t explain it to a 10-year-old, you shouldn’t own it.

2. Understand the finances before you invest. Never invest in a company without understanding its finances. Specifically, check if the company has too much debt. Companies with plenty of cash and little-to-no debt almost never go bankrupt, giving them the ultimate “staying power” during economic downturns. The biggest losses in stocks come from companies with poor balance sheets. Always look at the balance sheet to see if a company is solvent before you risk your money on it.

3. Brainpower isn’t the problem — stomach is. Everyone has the brainpower, but not everyone has the stomach. An investor’s temperament matters far more than their IQ. The market will inevitably experience downturns and sell-offs. If you are prone to panicking and selling everything when the market drops, you should avoid individual stocks entirely. If you sell stocks in panic, the stock market is not for you.

4. Your edge comes from what you already know. Your investor’s edge is not something you get from Wall Street experts. It’s something you already have. You can outperform the experts if you use your edge investing in companies or industries you already understand. Wall Street analysts are often the last to find great local or niche businesses. As a consumer, employee, or industry specialist, you see trends, popular products, and busy local stores months or years before the professionals do. Use this firsthand knowledge to find potential investment ideas.

5. Beat the market by ignoring the herd. The stock market has come to be dominated by a herd of professional investors. Contrary to popular belief, this makes it easier for the amateur investor. You beat the market by ignoring the herd. Nobody can reliably predict interest rates, the direction of the economy, or where the stock market will go next week. Trying to time the market based on macroeconomic predictions is a fool’s errand. Focus entirely on what is happening to the specific companies you own.

“Far more money has been lost by investors preparing for corrections, or trying to anticipate corrections, than has been lost in corrections themselves.” – Peter Lynch

6. Long-term stock success follows company success. Often, there is no correlation between the success of a company’s operations and the success of its stock over a few months or even a few years. In the long term, there is a correlation between the success of the company and the success of its stock. This disparity is the key to making money — it pays to be patient, and to own successful companies.

“I’ve never met anyone who can time the market. In fact, I’ve never met anyone who knows anyone who has ever successfully timed the market over the long term.” – Jack Bogle

7. Avoid hot stocks in hot industries. Avoid hot stocks in hot industries. Great companies in cold, non- glamorous industries are where the real finds are. The most hyped stocks in rapidly growing, glamorous industries are often the ones that collapse the fastest. Lynch preferred boring, overlooked companies in slow-growth or “cold” industries. They face less competition, have room to dominate, and are usually priced much more reasonably.

8. Corrections are opportunities, not disasters. If you’re prepared, corrections can’t hurt you. Corrections are great opportunities to pick up the bargains left behind by investors who are panicking. A stock market decline is as routine as a winter blizzard. If you expect it and prepare for it, it can’t hurt you. In fact, market corrections are the perfect time to buy great companies at bargain-basement prices from panicked sellers.

9. Study more companies — find more winners. If you study 10 companies, you will find 1 for which the story is better than expected. If you study 50, you’ll find 5. There are always pleasant surprises to be found in the stock market. It is easy to view stocks as mere blips on a screen or tickers that go up and down. Lynch constantly reminds investors that a stock represents partial ownership of a living, breathing business. If the business does well, over the long term, the stock will follow.

10. Time is on your side with great companies. Time is on your side when you own shares of superior companies. You can afford to be patient — even if you missed WalMart in the first five years, it was a great stock to own in the next five years. Truly life-changing wealth isn’t made overnight; it typically takes 3 to 10 years for a great company’s story to fully play out. Be patient. If the business fundamentals remain strong, let your “winners” run rather than selling them early to lock in minor gains.

The bottomline: do your homework, invest in what you understand, be patient, don’t try to time the market, and don’t let emotions drive decisions. Lynch’s edge was always bottom-up research, not macro predictions — which is why these rules hold up 30+ years later.